diff --git a/python/cudf/cudf/core/reshape.py b/python/cudf/cudf/core/reshape.py index 6e5abb2b82b..3d132c92d54 100644 --- a/python/cudf/cudf/core/reshape.py +++ b/python/cudf/cudf/core/reshape.py @@ -681,7 +681,7 @@ def _tile(A, reps): nval = len(value_vars) dtype = min_unsigned_type(nval) - if not var_name: + if var_name is None: var_name = "variable" if not value_vars: diff --git a/python/cudf/cudf/tests/test_reshape.py b/python/cudf/cudf/tests/test_reshape.py index 4235affd4d1..3adbe1d2a74 100644 --- a/python/cudf/cudf/tests/test_reshape.py +++ b/python/cudf/cudf/tests/test_reshape.py @@ -119,6 +119,15 @@ def test_melt_str_scalar_id_var(): assert_eq(result, expected) +def test_melt_falsy_var_name(): + df = cudf.DataFrame({"A": ["a", "b", "c"], "B": [1, 3, 5], "C": [2, 4, 6]}) + result = cudf.melt(df, id_vars=["A"], value_vars=["B"], var_name="") + expected = pd.melt( + df.to_pandas(), id_vars=["A"], value_vars=["B"], var_name="" + ) + assert_eq(result, expected) + + @pytest.mark.parametrize("num_cols", [1, 2, 10]) @pytest.mark.parametrize("num_rows", [1, 2, 1000]) @pytest.mark.parametrize(